How to activate mobile version

When I first started my website with Lifestyle, when I viewed the website on mobile, I saw this lovely mobile-optimized version of the website. I activated the Jetpack mobile version to see what it would look like, but I didn’t like it as much, so I deactivated the Jetpack mobile version. Now the version of the website is showing as the desktop version, which does not look good on mobile, and I can’t figure out how to get it to look like the mobile version that I originally liked.